Process of refining crude turpentine



Patented May 6, 1924.

um'raosTATas PATENT orrica.

CHARLES A. JOBSON, OF LOCK HAVEN, PENNSYLVANIA, ASSIGNOR TO NEW YORK AND PENNSYLVANIA COMPANY, OF LOCK HAVEN, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA PROCESS OF REFINING CRUDE TURPENTINE.

Ho Drawing.

To all whom it may concern:

Be it known that I, CHARLES A. JoBsoN, a citizen of the United States, residing at Lock Haven, in the county of'Olinton and State of Pennsylvania, have invented certain new and useful Improvements in Processes of Refining Crude Turpentine, of which the following is a specification.

This invention is a novel process for the purification and deodorization of crude turpentine. The process is applicable broadl .to the treatment of crude turpentine, om any source, but is a plicable with special advantage to the re ning ofthe crude by-product turpentine produced during the cooking or digestion of the various species of pine and coniferous woods by the so-called soda and sulfate processes. As is well known, this crude product is practically valueless, owing to its contamination by coloring matters and b ill-smelling im urities such as methy mercaptan, ally -mercaptan, and analogous sulfur-containing com ounds. By my process this crude materia may be transformed into a practically colorless refined product of a able odor, essentially indentical in its sical constants with gum turpentine.

o owing is an example of my process in its preferred embodiment, it being understood that the invention is not limited to the particular manipulations, or to the proortions of in redients therein set forth in etail; since t ese will naturally vary considerably according to nature of the crude product to be refined.

I provide an open tank which may be of wood, equipped with a mechanical agitator and with 'a perforated coil or equivalent device for the admission of compressed air. Into this I charge a mixture comprising approximately:

Orude turpentine 1 part Water 1.5- Hypochlorite solution 0.75

Application flled November 22, 1920.- Serial No. 4253M.

form of bleaching powder, sodium hy chlorite or the like. The mixture is t en thorou hly agitatedand aerated for a considerab e period, or until the completion of the initial reaction, which usually requires not less than'one hour. During this step of the process, which may be carried out at ordinary or somewhat higher temperatures, a reaction occurs which results in the formation of a fiocculent precipitate montaining or consisting of pinene hydrochloride. At the sametime gaseous products or vapors having a strong, un ent and disagreeable odor are elimina uring this step a portion of the coloring matter of the crude turpentine is takenup by the aqueous solution, and the disagreeable odor of the crude material is forthe most part dis elled.

At the cone usion of the agitating step the entire volume of liquor, including the flocculent precipitate, is run into a still which may be of an standard t and construction, equippe with a re ux condenser or rectifdying column, and with a final cooled con enser. The distillation is carried out in the usual manner, the heat being preferably applied either by means of closed steam coils, or by perforated steam coils, or by both of these means. Distillation in a current of steam is preferred since thereby the turpentine may be distilled over at relativel low temperatures, of the order of 9597 During this stage of the process the pinene hydrochloride undergoes ecomposition, or hydrolysis, yielding its pinene in a state of substantial purity.

The distillate consists of water and turpentine in variable proportions, easily se arated from each other by the usual meth The turpentine corresponds closely in boiling points, specific gravity and other constants to the best commercial grades, and is in ever respect a desirable commercial product. n oily residue remainin in the still and not as yet fully identi ed, possesses qualities indicating a marketable material.

I claim v 1. Process of refining crude turpentine the crude turpentine is derived as a byproduct from the digestion of coniferous woods.

In testimony whereof, I aflix my signature.

CHARLES A. J OBSON. 

